I think ihiyardi's has made some Environment Sensor models (Zigbee) with battery backup, but I'm not sure if it's included on this latest run (or if it ever was...maybe it always was and still is an optional "extension"?). Regardless, since it's USB power, there are lots of DIY options here that would be pretty easy to do as they would be for several others with USB power (USB power bank with Xbee as above, Ikea Trådfri USB repeater, or this module, for example). The Dome Extender (DMMS1) is also able to be powered by USB and would work with these options--which are not as pretty as ones with a battery built-in, of coure, but I suppose it depends on how much that matters. 
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